Aqueous ink jet ink composition and ink jet recording apparatus
An aqueous ink jet ink composition contains a pigment, propylene glycol, and water, in which the aqueous ink jet ink composition has the viscosity of 3.0 mm 2 /s or more and 10.0 mm 2 /s or less at 20° C., the aqueous ink jet ink composition has the pH of 7 or more, the content of the pigment is 5.5% by mass or more and 9% by mass or less based on the total amount of the aqueous ink jet ink composition, and the content of the propylene glycol is 8 parts by mass or more and 100 parts by mass or less based on 100 parts by mass of the pigment.
1. An aqueous ink jet ink composition comprising:
a pigment;
a solvent including propylene glycol, glycerol, 1,2-hexanediol, 2-pyrrolidone, and triethylene glycol, wherein a content of the propylene glycol is in the range of 0.5 to 9% by mass; and
water,
wherein the aqueous ink jet ink composition has a viscosity of 3.0 mm 2 /s or more and 10.0 mm 2 /s or less at 20° C.,
the aqueous ink jet ink composition has a pH of 7 or more,
a content of the pigment is 5.5% by mass or more and 9% by mass or less based on a total amount of the aqueous ink jet ink composition,
a content of the propylene glycol is 8 parts by mass or more and 100 parts by mass or less based on 100 parts by mass of the pigment, and
a specific surface area of the pigment measured by pulsed NMR is 20 m 2 /g or more and 55 m 2 /g or less.
2. The aqueous ink jet ink composition according to claim 1 , wherein
the pigment is carbon black.
3. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 2 .
4. The aqueous ink jet ink composition according to claim 1 , wherein
the pigment is a self-dispersible pigment.
5. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 4 .
6. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 1 .
7. The aqueous ink jet ink composition according to claim 1 , further comprising a pH adjuster that is at least one of potassium hydroxide and triethanol amine.
8. An aqueous ink jet ink composition comprising:
a pigment;
a solvent including propylene glycol, glycerol, 1,2-hexanediol, 2-pyrrolidone, and triethylene glycol, wherein a content of the propylene glycol is in the range of 0.5 to 9% by mass; and
water,
wherein the aqueous ink jet ink composition has a viscosity of 3.0 mm 2 /s or more and 10.0 mm 2 /s or less at 20° C.,
the aqueous ink jet ink composition has a pH of 7 or more,
a content of the pigment is 5.5% by mass or more and 9% by mass or less based on a total amount of the aqueous ink jet ink composition, and
a specific surface area of the pigment measured by pulsed NMR is 20 m 2 /g or more and 55 m 2 /g or less.
9. The aqueous ink jet ink composition according to claim 8 , wherein
the pigment is carbon black.
10. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 9 .
11. The aqueous ink jet ink composition according to claim 8 , wherein
the pigment is a self-dispersible pigment.
12. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 11 .
13. An ink jet recording apparatus comprising:
a line head discharging the aqueous ink jet ink composition according to claim 8 .
14. The aqueous ink jet ink composition according to claim 8 , further comprising a pH adjuster that is at least one of potassium hydroxide and triethanol amine.